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Followup Q for shekerra

Posted on 2002-05-30
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Does a T-tail (such as on a Citation) have a noticeable effect on elevator authority in an accelerated stall?
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Question by:cookre
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GUEEN earned 100 total points
ID: 7045697
The elevator (at low speeds) tends to ride in a burble of air behind the main wing creating a rough ride.  Early t-tails used to suffer from a condition known as "deep stall" where the main wing was stalled due to high angle of attack, and the t-tail was in the turbulent air behind the main wing.  Because the air was turbulent, the elevator
could not provide the control power necessary to kick the nose down for stall recovery.  Because the wing was stalled, the ailerons would not work, either, to allow a roll recovery.  The aircraft would descend,stable in the stall, right into the ground.  Needless to say, it would
spoil the day for everyone on board.

Later changes to the certification standards required systems to prevent the condition (stall warning, stick pushers and the like), sufficient engine power available in the stalled condition to push the aircraft out
of a stall (increased forward speed will reduce effective angle of attack), and that the inner wing stall before the outer wing, leaving the aileron portion unstalled later into the deep-stall condition.
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by:cookre
ID: 7045855

In answer to your question in that other thread, yes, you now qualify.
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by:GUEEN
ID: 7046052
LOL thanx cookre :)
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by:cookre
ID: 7050215
Addition commentary in the original thread:
http://www.experts-exchange.com/jsp/qManageQuestion.jsp?qid=20305509
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